| (19) |
 |
|
(11) |
EP 0 436 367 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
02.01.1992 Bulletin 1992/01 |
| (43) |
Date of publication A2: |
|
10.07.1991 Bulletin 1991/28 |
| (22) |
Date of filing: 21.12.1990 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE DK FR GB IT NL SE |
| (30) |
Priority: |
26.12.1989 US 456400
|
| (71) |
Applicant: ARCO Chemical Technology, L.P. |
|
Greenville, Delaware 19807 (US) |
|
| (72) |
Inventors: |
|
- Sonnenberg, Fred M.
Merion,
Pennsylvania 19066 (US)
- Hajnik, Dennis M.
West Chester,
Pennsylvania 19380 (US)
|
| (74) |
Representative: Cropp, John Anthony David et al |
|
MATHYS & SQUIRE
100 Grays Inn Road
London, WC1X 8AL
London, WC1X 8AL (GB) |
|
| |
|
| (54) |
Process for the preparation of fire-retardant expandable thermoplastic beads |
(57) Fire-retardant expandable vinyl aromatic polymer beads are prepared by an aqueous
suspension method whereby a bromophenyl allyl ether fire-retardant agent and a volatile
aliphatic hydrocarbon foaming agent are incorporated into particles of a thermoplastic
such as polystyrene. The beads are useful in the preparation of molded foam articles
having excellent resistance to flame.